Everything except 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.
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2 is a factor of 72. (36*2)
The number that is a factor of 72 and a multiple of 8 is 8. A factor of a number divides that number evenly without leaving a remainder, and 8 divides 72 evenly. Additionally, a multiple of a number is the result of multiplying that number by an integer, and 8 multiplied by 9 equals 72. Therefore, 8 is both a factor of 72 and a multiple of 8.
Not a factor of 18 ?
36
The GCF of 72 and 144 is 72. Since 72 is a factor of 144, it is automatically the GCF.